Abstract Title:

Consumption of Quercetin and Quercetin-Containing Apple and Cherry Extracts Affects Blood Glucose Concentration, Hepatic Metabolism, and Gene Expression Patterns in Obese C57BL/6J High Fat-Fed Mice.

Abstract Source:

J Nutr. 2016 Apr 6. Epub 2016 Apr 6. PMID: 27052533

Abstract Author(s):

Sarah M Snyder, Bingxin Zhao, Ting Luo, Clive Kaiser, George Cavender, Jill Hamilton-Reeves, Debra K Sullivan, Neil F Shay

Article Affiliation:

Sarah M Snyder


BACKGROUND: Intake of polyphenols and polyphenol-rich fruit extracts has been shown to reduce markers of inflammation, diabetes, and hepatic complications that result from the consumption of a high-fat (HF) diet.

OBJECTIVE: The objective of this study was to determine whether mice fed polyphenol-rich apple peel extract (AE), cherry extract (CE), and quercetin, a phytochemical abundant in fruits including apples and cherries, would modulate the harmful effects of adiposity on blood glucose regulation, endocrine concentrations, and hepatic metabolism in HF-fed C57BL/6J male mice.

METHODS: Groups of 8-wk-old mice (n= 8 each) were fed 5 diets for 10 wk, including low-fat (LF; 10% of total energy) and HF (60% of total energy) control diets and 3 HF diets containing polyphenol-rich AE, CE, and quercetin (0.2% wt:wt). Also, an in vitro study used HepG2 cells exposed to quercetin (0-100μmol/L) to determine whether intracellular lipid accumulation could be modulated by this phytochemical.

RESULTS: Mice fed the HF control diet consumed 36% more energy, gained 14 g more body weight, and had∼50% elevated blood glucose concentrations (allP<0.05) than did LF-fed mice. Mice fed HF diets containing AE, CE, or quercetin became as obese as HF-fed mice, but had significantly lower blood glucose concentrations after food deprivation (-36%, -22%, -22%, respectively;P<0.05). Concentrations of serum C-reactive protein were reduced 29% in quercetin-fed mice compared with HF-fed controls (P<0.05). A qualitative evaluation of liver tissue sections suggested that fruit phytochemicals may reduce hepatic lipid accumulation. A quantitative analysis of lipid accumulation in HepG2 cells demonstrated a dose-dependent decrease in lipid content in cells treated with 0-100μmol quercetin/L (P<0.05).

CONCLUSIONS: In mice, consumption of AE, CE, or quercetin appears to modulate some of the harmful effects associated with the consumption of an obesogenic HF diet. Furthermore, in a cell culture model, quercetin was shown to reduce intracellular lipid accumulation in a dose-dependent fashion.

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